log-mean temperature difference

log-mean temperature difference

[′läg ¦mēn ′tem·prə·chər ‚dif·rəns]

(thermodynamics)

The log-mean temperature difference TLM= (T2-T1)/ln T2/ T1, where T2 and T1 are the absolute (K or °R) temperatures of the two extremes being averaged; used in heat transfer calculations in which one fluid is cooled or heated by a second held separate by pipes or process vessel walls.

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